Duplex bag body



' April 4, 1950 A. s. RoPER 2,502,481

Dumm: BAG BODY Filled Dec. 7, 1946 ab sii MQEMM A fraz/ve' YJ- Patented Apr. 4, 1950 UNITED STATES PATENT OFFICE y DUPLEX BAG BODY Amund S. Roper, Minneapolis, Minn., assignor to Bemis Bro. Bag Company, Minneapolis, Minn., a corporation of Missouri Application December 7, 1946,' Serial No. 714,703

the bag body having a window opening therein,

and the outer ply being constructed of a suitable transparent material such as cellophane, which provides a protecting covering for the inner ply and also completes the formation of the window provided in a wall thereof.

A further object is to provide a duplex bag comprising an inner paper ply and an outer cellophane ply, and the inner ply having a window opening in one or more of its walls and the outer cellophane ply being secured to the inner ply around the window opening therein, thereby to prevent leakage of the contents of the bag into any spaces present between said plies. A

A further object is to provide a duplex bag body which is extremely simple and inexpensive to manufacture and which, when filled with a suitable product, presents a very neat and attractive appearance.

A further object is to provide an attractiv package for displaying and merchandising various. commodities, particularly food articles, comprising a duplex body composed of an inner ply having a window opening therein, which inner ply is completely enclosed within an outer transparent ply, such as cellophane, which is suitably secured to the inner ply, particularly around the window opening therein, thereby to complete ,the formation of the window, and whereby the contents of the package may readily be viewed through said window, when the package is displayed on a shelf or counter'.

A further and more specicobject is to provide of the inner member, or to the inner surfaceV of the outer member whereby when the bag Ibody is completed, the printed matter will be completely enclosed within the outer cellophane member and will be readily noticeable therethrough and, in

addition, will be well protected by the outer cellophane.

Other objects of the invention will appear from 1 Claim. (Cl. 229-55) ,the following description and the accompanying drawings and will be pointed out in the annexed claim.

In the accompanying drawings there has been disclosed a structure designed to carry out the various objects of the invention, but it is to be understood that the invention is not confined to the exact features shown, as various changes may be made within the scope of the claim which follows.

In the drawings: v

Figure 1 is a view showing a bag body blank including an inner paper ply and an outer transparent ply, and indicating how said plies may be bonded together at their top and bottom edges by spot pasting, as is well known in the art, and also illustrating a method of forming a Window in a wall of the bag body ;y

Figure 2 is a view showing the bag body blank illustrated in Figure l folded upon itself to complete the bag body except for the bottom;

Figure 3 is a perspective view of a filled bag lwith its bottom and top ends sealed, and illus trating how the contents of the-bag may be viewed through the window opening provided in a wallof the inner member; and I Figure 4 is a side view of a lled bag partially broken away to illustrate the construction of the window provided Iin a wall of the outer member.

The novel bag body herein disclosed is shown composed of two blanks of sheet material which may be cut from elongated webs of sheet material, as is well known in the art. The inner web, designated by the numeral '2, is preferably of a suitable paper such as isrcommonly used in the manufacture of paper bags, which, in the process of making the bag is divided into sections 3, 4 and 5 by longitudinally extending fold lines 6 and 1.

A suitable window opening 8 is cut in a wall section of the inner `ply which, in the finished bag, is closed by the outer transparent ply 9, which preferably is constructed of a transparent material such as cellophane, well known in the industry.

'I'he cellophane blank is preferably substantially of the same size and contour as the inner ply 2, and overlies the inner ply,.2 and is suitably secured thereto by a suitable adhesive such as illustrated, for example, at Il and l2 in Figure 1.

The outer transparent ply 9 is preferably slightly laterally offset from the inner ply 2, whereby the marginal edge portion I3 of the inner ply will extend slightly beyond the adjacent edge I4 of the transparent outer ply, at one side parent ply 9 will project beyond the adacent opposite edge I6 of the inner ply 2, as clearly shown in Figure 1. When the two plies are placed one on top .of the other, and suitably secured together by spot pasting along the top and bottom edges of the blank, the two plies become in effect a composite Wall structure which may then be folded upon itself along the fold lines 6 and 1, and additional fold lines I1, I8, I9 and 2|, to complete the formation of the bag body.

It is to be understood that in the process of forming the bag body, a suitable adhesive, generally indicated by the numeral 22, may be applied to the outer surface of the inner member around the window opening 8, as shown in Figure 1, which adhesive serves to hermetically bond together the two plies around the window, thereby to prevent' leakage through the Window into any spaces which may occur between the two plies.

After the bag blank, shown in Figure 1 has been folded into the form shown in Figure 2,

with the marginal edge portions I3 and I5 of the plies bonded together, as shown, the bottom may be formed in any suitable manner to complete the formation of the bag body for receiving a charge of material. After the bag body has been filled, its top wall portions may be folded into closing and sealing engagement with one another and suitably bonded together to complete the formation of the sealed bag top. If desired, the entire contactinglsurfaces of the tWO plies may be bonded together by applying a suitable adhesive to either the entire inner surface of the outer transparent member, except at the location of the window opening, or to the entire outer surface of the inner member, in which case the Wall plies will be bonded together to form in effect, an integral wall structure. This, however, is a matter of choice.

When a bag has been completed and filled, as shown in Figures 3 and 4, the contents of the bag body may readily be noted through the transparent window provided in the wall thereof. In the present application, I have shown but one of the walls of the bag body as having a window therein. It is to be understood that if desired, windows may be provided in other walls of the bag body, although in normal use, a single window in one of the side walls of the bag body has proven sufficient.

By constructing the bag as above described, printed matter to be displayed on the bag body may be applied directly to the outer surface of the inner paper ply whereby it may be readily noted through the outer transparent cellophane ply. Or, if desired, the printed matter may be applied directly to the inner surface of the outer transparent ply which will give the completed bag substantially the same appearance, as when the printed matter is applied directly to the inner member.

It is also to be understood that the window openings provided in the walls of the bag body may be made to any desired size or shape fwithout departing from the scope of the invention.

It will be apparent those skilled in the art that I have accomplished at least the principal objects of my invention, and it will also be apparr ent to those skilled in the art that the embodiments herein described may be variously changed and modified without departing from the spirit of the invention, and that the invention is capable of uses and has advantages not herein specically described; hence it will be appreciated that the herein disclosed embodiments are illustrative only,

l and that my invention is not limited thereto.

I claim as my invention:

A bag composed of flexible dual-ply wall bag body comprising an inner ply of exible opaque paper having a window opening formed in at least one of the walls of said inner ply, an outer ply of a flexible transparent cellophane sheet disposed over and covering one face of said inner ply, a narrow continuous strip of the surface of one of the contacting faces of said innerand outer plies adjacent the edge of the window opening formed in said inner ply having an adhesive coating for bonding said inner and outer plies in a limited area, and a plurality of small spaced isolated areas on one of the contacting faces of said inner and outer plies adjacent the marginal edges thereof at the top and bottom of said bag having an adhesive coating for bonding said inner and outer plies at saidisolated areas, the contacting faces of said inner and outer plies in the remaining area being free to move relatively.'

whereby said bag may be flexed Without causing deterioration of said outer cellophane ply.

.AMUND S. ROPER.

REFERENCES CITED The following references are of record in the le of this patent: 

